Revert 181330 "Revert 180822 "Specify clip rects when drawing Ma..."

Revert 181330 "Revert 180822 "Specify clip rects when drawing Ma..."

Reverting my revert - per Chris, performance will be awful due to changes
which have landed on top of this.
BUG=409708
> Revert 180822 "Specify clip rects when drawing Mac native widgets"
> 
> Speculatively reverting to address scrollbar dev blocker
> BUG=409708
> Note there were some conflicts in the TestExpectations file, I did not try to resolve
> 
> > Specify clip rects when drawing Mac native widgets
> > 
> > Add the clip rect as an argument to LocalCurrentGraphicsContext,
> > and specify the rect for all callers. Add the rect argument for the one
> > direct caller to SkiaBitLocker (the argument will be made a requirement
> > once this lands).
> > 
> > De-duplicate a bunch of rectangle-inflating code and move it into
> > ThemeMac.
> > 
> > For the selected widgets that draw their own focus rings (most don't),
> > simply specify the maximum inflation of the clip rect as 16 pixels on
> > each side. This appears to be very generous. The correct API call to
> > compute this, focusRingMaskBoundsForFrame, was introduced in the
> > 10.7 API, and the widgets that draw their own focus rings wouldn't
> > need to do so if written against the the 10.7 API.
> > 
> > BUG=247716
> > 
> > Review URL: https://codereview.chromium.org/488353003
> 
> TBR=ccameron@chromium.org
> 
> Review URL: https://codereview.chromium.org/536973002

TBR=amineer@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=181331

[amineer_google, 2014-09-03 17:44:05]

Committed patchset #1 (id:1) manually as r181331.